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R. H WHISLERX l-GNITION SYSTEM.

APPLICATION FILED JAN. IQ, 1919.'

1,376,845. Patented May 3, 1921.

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RALPH H. WEISLER, OI DETBOI'I, T'ZICHlIG-AN, ASSIGNQR TO ESSEX MOTORS,OI IDE'IEUIT, TdXlIlHIQhhN. .A C'GRPQRATEON OF MICHIGAN.

summon siz'sicnni.

Specification of Letters Patent.

To all 'i-chom it may concern:

Be it known that I, RALPH H. WHisLnn, a citizen of the United States,residing at Detroit, county of Wayne, State of Michigan. have invented acertain new and useful Improvement in Ignition Systems, of'which thefollowing is a specification, reference being had therein o theaccompanying drawin s.

ily invention relates to a coil to be used as a part of the ignitionsystem described in my prior application Serial No. 213,655, filed Jan.25, 1918. As'therein described said ignition system comprises threecircuits (11.) a circuit in which is a source of electromotive forcesuch as a batterv, circuit breaker operated in time with the engine andthe primary of an induction coil; (b) a circuit in which is located thesecondary of said induction coil, a discharge gap and the primary of a.disruptive discharge coil; and (c) a circuit containing the secondaryofsaid disruptive discharge coil and the electrodes of a spark plug, saidelectrodes being located in the combustion chamber of an internalcombustion engine.

In the practical application of my in vention, I find it desirable tomake the dis-.

ruptive discharge coil into a unit which may. be placed on the top ofthe spark plug. The present invention therefore has for itsobject toprovide such a "unit. The coil embodying my invention is so constructedthat it may be applied to a spark plug or removed ti'ierefrom veryquickly. It is neat and compact and performs its electrical functionssatisfactorily.

The invention will be fully understood from the following descriptionwhen taken in connection with the accompanying drawings and the novelfeaturesthereot' will be pointed out and clearly defined in the claimsat the close of this specification.

In. the drawings, Figure 1 is a side eleva tion partly in section of aspark plug to which is applied the coil embodying the present invention.

Fig. 2 is a vertical section of the coil shown in Fig. 1 with thewindings removed.

Fig. 3 is a section of the coil support 18 on line 3-3 of Fig. 1. v

Referring now to the drawings, at A is shown-a spark plug of ordinaryconstruction being grounded on the cylinder block of the engine asindicated at B. The electrodes are designated 10 and 11 respectively.The electrode 11 is centrally disposed within an insulating bushing 12and has its upper end donned into a screw threaded terminal 13 in Fig.l. The lower end of the spool 15 is inclosed in a metallic support 18 towhich the ends of the wires of the two coils 16 and 17 are electricallyconnected as shown at 20 and 21. The support 18 is formed with a seriesof downwardly projecting legs or prongs 19 separated by spaces 22, (seeFig. 3). The legs or prongs rest on the metallic body portion 14 of thespark plug and are rabbeted slightly as shown at a to fit over theshoulder more securely. It will be seen that there is a. metalliccontact between the metallic support 18 and the bodyof the spark plugwhich is itself screwed into the engine so that the primary winding ofthe coil is grounded.

Centrally disposed of the. coil is a stem electrode 11 of the sparkplug-A. The

upper end ofthe stem 23 is provided with a thumb nut 25 and a spring 26is interposed Patented May 3, 1921.

i 23 screw threaded at its lower end as shown at 9A: to receive theupper end of the central The coil is secured to the spark plug by meansof the stem 23. When it is desired to put the coil'in place it is set ontop of the spark plug with the prongs 19 of the metallic support restingon the metallic body 14 of the spark plug. The stem 23 is then screweddown onto the upper end of the centralelectrode ll-rbf the spark pluguntil the spring 26 is compressed somewhat. This thence returns i "rhoprinmry source.

member 2? to the stem holds tho coil Emily on. plug and the springpzmsion wiihoul any i or any resulting electrical confirms.

When in place on the mrlr plug, lhecurrent entering through wire :59 andpost 28, passes through the primary winding 16 and through themetslllcsxq port 1S sml the spark plug body 1% to the engine block indhe current generated in thc womlsry winding 1'? of the coil pass-o5through the contact. 533, illil'lcii through the central electrode lland across the gap to the electrode thence lzhrough plug body 14,support 18 and crmncclio'n 20 back to winding 17. The constructionclcscrihsd is such that, while the support l8 r sss firmly on anrl makesa good electrical connection with the body of the spark plug, air maynevertheless circulate through the interior ill of the coil thus tendingto keep both coil and spark plug cool. The air enters through "1 oi ihospark unequal the spaces 22, passes up around the centrzr slam 53 andout at the cop through 0. l; 3: claim is: 'M Q11. comoinalion with aspark plug having a control electrode the. end of which is screwthreaded, coil comprising primary zmzl secondm' windings on wspo'ol, anda central nae-ml it screw threaded. for engagement with che spark plugand electrically connected will) sold secondary windinm ln conihinzxtlonwith a spark plug having a control slsctrozle the and of which is screwain-ended o coil. comprising primary and sccowlary findings on. a spool,a metallic support for the coil adapted to lit the metallic shell of thospark plug, both of sold coils being clecrricully connected to thesupport, and a central member screwtlircmlell for engagement with theelectrode, said central member being electrically connected with ilksecondary winding and sewing lo secoro the coil to the spark plug andalso to make electrical contact with the electrode.

lo testimony whereof lollix my signature.

RALPH H. Win-sum

